Effects of Coalescence on Shear-Induced Gelation of Colloids

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F17%3A43914754" target="_blank" >RIV/60461373:22340/17:43914754 - isvavai.cz</a>

Result on the web

<a href="https://pubs.acs.org/doi/pdf/10.1021/acs.langmuir.6b03707" target="_blank" >https://pubs.acs.org/doi/pdf/10.1021/acs.langmuir.6b03707</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.langmuir.61303707" target="_blank" >10.1021/acs.langmuir.61303707</a>

Result language

angličtina

Original language name

Effects of Coalescence on Shear-Induced Gelation of Colloids

Original language description

Shearing lyophobic colloidal suspensions can lead to aggregation, followed by gelation, if the formed clusters grow to sizes large enough to percolate. If the temperature is set over the glass transition temperature of the suspended material, the particles embedded in the same aggregate start to coalesce with one another. Coalescence occurs to the finite viscosity of the particles&apos; material, which leads to material diffusion from particle to particle. The driving force of this process is the reduction of the particle dispersant interface and, as a consequence, the decrease the center -to-center separation of the particles. This leads to decreased cluster size, and hence a delayed gelation. Simultaneously, coalescence reinforces the particle particle bonds formed upon aggregation, leading to clusters that are able to resist higher hydrodynamic forces before breaking up, hence leading to faster gelation. These two competing effects, combined with the natural complexity of colloidal aggregation makes it rather difficult to understand and predict which trend becomes dominant. In the present work, the shear-induced gelation of model polymeric colloidal systems with different glass transition temperatures has been studied. Starting with their interaction potential we investigate the impact of temperature on the gel time in concentrated suspensions (phi = 5%) under steady shear, followed by the effect of temperature on the stress-resistance of fully destabilized clusters under agitation. The results of the present work allow for a systematic view and deepened understanding of the factors governing shear-induced gelation in the presence of coalescence.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20401 - Chemical engineering (plants, products)

Project

<a href="/en/project/GA16-22997S" target="_blank" >GA16-22997S: Preparation of Porous Materials by Controlled Assembly of Nanoparticles</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Langmuir

ISSN

0743-7463

e-ISSN

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Volume of the periodical

33

Issue of the periodical within the volume

5

Country of publishing house

US - UNITED STATES

Number of pages

9

Pages from-to

1180-1188

UT code for WoS article

000393737400008

EID of the result in the Scopus database

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